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How to Plumb Clippard's Cordis Pressure Controller for Vacuum


Clippard's Cordis Series Electronic Pressure Controller can be calibrated anywhere from full vacuum to 150 psi. In this video, Clippard Product Manager Doug Paynter explains how to properly plumb the Cordis CPC series when working with vacuum.

Video filmed at Clippard in Cincinnati, Ohio


Hi everyone, let’s talk about how to plumb the Cordis CPC Series up for vacuum and vacuum through positive pressure.

The Cordis CPC Series can be calibrated anywhere from full vacuum to 150 psi. We have a multitude of sensors to choose from and can map them out to provide you with the best-fit calibration while still maintaining the accuracy, resolution, and repeatability your complex applications require. Let’s hone in on how to properly plumb the Cordis CPC Series when working with vacuum.

The Cordis CPC is a fill-and-bleed electronic pressure controller. One proportional valve is dedicated to filling (inlet), and one proportional valve is dedicated to bleeding (exhaust). As you can see, we have three primary ports: supply, exhaust, and outlet.

When working with vacuum, we leave the supply inlet port open to atmosphere and place the vacuum supply source on the exhaust port. So if I have a 0 to -15 psi or 29” Hg output calibration to a 0-10 VDC command signal, a 10v command will equal full vacuum.

The exhaust proportional valve becomes the primary valve, which allows the vacuum supply to draw pressure through the outlet port from the downstream work area. This vacuum pressure is monitored via an onboard or external sensor that enables the comparative circuit to accurately close the loop around the downstream vacuum.

If my command changes to reduce the level of downstream vacuum, say from a 10v signal to a 5v command, the comparative circuit will open the inlet valve, which allows atmosphere into the downstream work area, which reduces the level of downstream vacuum to the actual calibrated range.

But what do you do when the application calls for both vacuum and positive pressure through the same Cordis unit? Simple—you now apply positive supply pressure to the inlet port. The comparative circuit controls the proportional valves to maintain the proper downstream pressure. So using a 15 psi differential sensor enables the Cordis to provide complete pressure control between full vacuum and 15 psi—two ranges out of one unit.

If you liked this video, please give it a thumbs up and subscribe to our YouTube channel for more. As always please give us a call to discuss your application needs. I am Doug Paynter, Proportional Product Manager here at Clippard. Thank you for your time.